An owned SKU is any SKU that belongs to Infurnia or the organisation you are part of, whereas an unowned SKU is that which belongs to any organisation that does not include yours or Infurnia.
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In order to edit the properties of an SKU, or change its location, it is necessary to own the SKU. To own an SKU, the desired SKU must be cloned. An owned SKU is marked by the black OWNED label on its group thumbnail.